The birds can be raven cleaver if they are summoned as 'ravens', but she normally summons them as 'tools' where she can control them first hand or give them orders to follow. All ravens released in the ship are of the latter; basically nen-bot-birds doing their best to follow a command. After exacting the peck on your head, it would go back to prioritizing exploration. If you tied a thread about it's neck and forced it to the ground and kept it from flying or going in a certain direction it would simple learn to walk and go in an opposite direction. So yeah that could work lol